Linear launches multifunctional PMIC
A Linear Technology Corp product story
Edited by the Electronicstalk editorial team Nov 18, 2009
Linear Technology has announced the LTC3554, a micropower, multifunctional power management integrated circuit (PMIC) solution for portable Li-ion/polymer battery-based applications.
The LTC3554 integrates a USB-compatible linear Powerpath manager, a stand-alone battery charger, two high-efficiency synchronous buck regulators and pushbutton control in an ultra-thin (0.55mm) 3mm x 3mm QFN package.
Linear Technology has announced the LTC3554, a micropower multifunction PMIC solution for portable Li-Ion/Polymer battery-based applications.
A pin-selectable standby mode reduces battery drain current to just 10uA with all outputs on.
The LTC3554 is well suited to low power portable device applications, including personal navigation devices (PNDs), media players and hand-held medical and industrial devices.
The LTC3554's Powerpath manager with automatic load prioritisation manages the transition between multiple input sources to power the load, while delivering up to 400mA battery charge current from a USB port or 5V wall adapter supply.
The input current limit is pin-selectable and internally set (no external resistor is required).
The LTC3554 is compatible with inputs up to 5.5V (7V absolute maximum transient for added robustness).
The device's 'instant-on' operation ensures system load power even with a fully discharged battery.
Autonomous operation simplifies design, eliminating the need for an external microprocessor for charge termination.
The internal 240mohm diode provides a low loss power path to the load when input current is limited or unavailable.
An NTC function is onboard for temperature-qualified charging.
The LTC3554's two integrated synchronous buck regulators feature 100 per cent duty cycle operation and are capable of delivering output currents of 200mA each, with adjustable output voltages down to 0.8V.
For flexibility, the regulators may be enabled and disabled independently.
The oscillator frequency and corresponding slew rate circuitry are pin-selectable (1.125MHz or 2.25MHz), allowing the application circuit to dynamically trade off efficiency and EMI performance.
The high switching frequencies also allow the use of tiny low-cost capacitors and inductors less than 1mm in height.
Internal low RDS(ON) switches enable efficiencies as high as 93 per cent, further maximising battery run time.
In addition, Burst Mode operation optimises efficiency at light loads with a quiescent current of only 25uA per regulator (less than 1uA in shutdown).
The regulators are stable with ceramic output capacitors, achieving very low output voltage ripple.
The integrated pushbutton controller provides buck regulator sequencing and access to an ultra-low current (less than 1uA) Hard Reset state, saving battery run time.
The LTC3554 is available from stock in a compact, ultra-low-profile (0.55mm) 3mm x 3mm UTQFN-20 package.
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Contact Linear Technology Corp
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Other Linear Technology Corp stories
- Linear unveils dual IR/baseband receiver subsystem
Linear Technology has introduced the LTM9002 dual infrared (IR)/baseband receiver subsystem. - Battery charger controllers keep efficiency high
Linear Technology has introduced the LTC4012, LTC4012-1 and LTC4012-2 - fast-charge 4A-capable high-efficiency switchmode battery charger controllers for multiple battery chemistries. - Linear introduces four-port PoE controller
Linear Technology has unveiled the LTC4266 four-port power-over-Ethernet (PoE) controller for power sourcing equipment (PSE) needed to provide IEEE 802.3at (25.5W) or proprietary higher power levels. - Linear releases dual-channel DC/DC converters
Linear Technology has introduced the LT3582, LT3582-5 and LT3582-12 dual-channel DC/DC converters. - Linear introduces micropower boost converter
Linear Technology has brought out the LT8415, a low-noise micropower boost converter with integrated dual half-bridge switches.
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